Copolymerization
of Propylene and Polar Monomers Using
Pd/IzQO Catalysts
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Abstract
Palladium catalysts bearing imidazo[1,5-<i>a</i>]quinolin-9-olate-1-ylidene
(IzQO) ligands polymerize α-olefins while incorporating polar
monomers. The steric environment provided by N-heterocyclic-carbene
(NHC) enables regioselective insertion of α-olefins and polar
monomers, yielding polypropylene, propylene/allyl carboxylate copolymers,
and propylene/methyl acrylate copolymer. Known polymerization catalysts
bearing NHC-based ligands decompose rapidly, whereas the present catalyst
is durable because of structural confinement, wherein the NHC-plane
is coplanar to the metal square plane. The present catalyst system
enables facile access to a new class of functionalized polyolefins
and helps conceive a new fundamental principle for designing NHC-based
ligands